Editor crashing when testplaying

Integrations Unreal Engine Plugin
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1

Hi guys, the UE 5.7.4. editor keeps crashing as soon as I start the game inside the viewport. I added the facesync and everything to a metahuman. Fails every time with this crash error message:

Unhandled Exception: 0xc06d007f

KERNELBASE
UnrealEditor_Convai!__delayLoadHelper2() [D:\a_work\1\s\src\vctools\delayimp\delayhlp.cpp:409]
UnrealEditor_Convai!_tailMerge_convai_client_dll()
UnrealEditor_Convai!UConvaiSubsystem::ToggleSTT() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Source\Convai\Private\ConvaiSubsystem.cpp:1132]
UnrealEditor_Convai!UConvaiPlayerComponent::UnmuteStreamingAudio() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Source\Convai\Private\ConvaiPlayerComponent.cpp:817]
UnrealEditor_Convai!UConvaiPlayerComponent::StartSession() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Source\Convai\Private\ConvaiPlayerComponent.cpp:743]
UnrealEditor_Convai!UConvaiPlayerComponent::OnServerConnectionStateChanged() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Source\Convai\Private\ConvaiPlayerComponent.cpp:868]
UnrealEditor_Convai!UConvaiPlayerComponent::execOnServerConnectionStateChanged() [d:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Intermediate\Build\Win64\UnrealEditor\Inc\Convai\UHT\ConvaiPlayerComponent.gen.cpp:750]
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Convai!TMulticastScriptDelegate::ProcessMulticastDelegate() [D:\RocketSync\5.7.0-47537391+++UE5+Release-5.7\Working\Engine\Source\Runtime\Core\Public\UObject\ScriptDelegates.h:929]
UnrealEditor_Convai!FOnServerConnectionStateChangedSignature_DelegateWrapper() [d:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Intermediate\Build\Win64\UnrealEditor\Inc\Convai\UHT\ConvaiSubsystem.gen.cpp:83]
UnrealEditor_Convai!UConvaiSubsystem::OnConnectedToServer'::2’::<lambda_1>::operator()() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\ConvAI\Source\Convai\Private\ConvaiSubsystem.cpp:1317]
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

I don’t get it, I cannot use convai no matter what, please help.

2

Hello,

Which version of the Convai Unreal Engine plugin are you using?

Could you also please share the full crash log so we can review the issue in more detail?

3

Hey, thanks for the swift reply. It’s the beta 4 version. The text you saw is the entire crash log.

4

There isn’t a version specifically called “beta 4.” Could you please share the exact Convai Unreal Engine plugin version you are using?

Also, the crash message alone is usually not enough to investigate the issue. Please share the full Unreal Engine log file so we can review the detailed error information.

5

The exact version number is 4.0.0 Beta 15, the latest plugin version from Fab. Log file I can provide, where shall I send it?

6

Could you please try the latest version?

7

Will do asap ! Thank you, will report back.

9

So now it doesn’t crash, conversation works BUT mouth of metahuman not moving when speaking although face anim has been applied. The plugin says that character class shall be set to Pawn instead of ConvaiBaseCharacter (says deprecated). And when I apply convai body animation, the body is completely deformed (I set it back to manny basic anim then). I added the Convaichatbotcomponent, no idea why the avatar’s mouth is not moving.

10

Please make sure to follow this video.

11

Okay, will do, in the meanwhile found that metahuman zip file. Will watch the video, thanks a lot.

12

So it works, conversation, face anim. Still the body animation makes a mess out of the avatar. I did it exactly the way it was shown in the video.

Screenshot 2026-05-12 002344
Screenshot 2026-05-12 0023441920×1041 159 KB

13
14

Now everything works … locally. I uploaded the build (all plugins activated including pixelstreaming) to the ps server. I do have the professional tier but still on the ps server the conversation does not work.

17

You are checking the old documentation. V4 doesn’t support pixel streaming.

18

Oh noooo, when will it?

19

Or do I need to use v 362 ?? I hope v4 will support it soon.

20

We don’t currently have plans to support Pixel Streaming on V4. If needed, you can continue using V3, but please note that it will no longer receive updates.